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210
The Fairy-Land of Science
·
Arabella B. Buckley
42
But
there
is
still
another
way
in
which
these
plants
may
give
out
the
heat-waves
they
have
imprisoned.
You
will
remember
how
we
learnt
in
the
first
lecture
that
coal
is
made
of
plants,
and
that
the
heat
they
give
out
is
the
heat
these
plants
once
took
in.
Think
how
much
work
is
done
by
burning
coals.
Not
only
are
our
houses
warmed
by
coal
fires
and
lighted
by
coal
gas,
but
our
steam-engines
and
machinery
work
entirely
by
water
which
has
been
turned
into
steam
by
the
heat
of
coal
and
coke
fire;
and
our
steamboats
travel
all
over
the
world
by
means
of
the
same
power.
In
the
same
way
the
oil
of
our
lamps
comes
either
from
olives,
which
grow
on
trees;
or
from
coal
and
the
remains
of
plants
and
animals
in
the
earth.
Even
our
tallow
candles
are
made
of
mutton
fat,
and
sheep
eat
grass;
as
so,
turn
which
way
we
will,
we
find
that
the
light
and
heat
on
our
earth,
whether
it
comes
from
fires,
or
candles,
or
lamps,
or
gas,
and
whether
it
moves
machinery,
or
drives
a
train,
or
propels
a
ship,
is
equally
the
work
of
the
invisible
waves
of
ether
coming
from
the
sun,
which
make
what
we
call
a
sunbeam.
Lastly,
there
are
still
some
hidden
waves
which
we
have
not
yet
mentioned,
which
are
not
useful
to
us
either
as
light
or
heat,
and
yet
they
are
not
idle.
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